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The Exchange of Gases in the Lungs

The exchange of gases takes place in the alveoli of the lungs. Oxygen passes into the blood and carbon dioxide passes into the atmospheric air.
The exchange of oxygen and carbon dioxide is due to the difference of partial (парциальное) pressure of these gases in the alveolar air and in the venous blood.
The partial pressure of oxygen in the alveolar air is higher than in the venous blood. The transfer of oxygen from the atmospheric air into the blood is due to this difference of pressures.
The partial pressure of carbon dioxide is higher in the venous blood and this enables carbon dioxide to pass from the blood into alveolar air.
The process of transfer of gases into the medium (среда) with a lower partial pressure iscalled diffusion. Hemoglobin is that substance of the blood which transfers oxygen in the blood. The oxygen capacity of the blood averages to 18-20 milliliters (ml) per 100 gr of blood. Carbon dioxide is transferred in combination with hemoglobin and as bicarbonic salts.
The combination of oxygen and hemoglobin is called oxyhemoglobin, that of carbon dioxide and hemoglobin — carbohemoglobin.

Task 1.
Answer the questions:

1. Where does the exchange of gases take place?
2. Where do oxygen and carbon dioxide pass into?
3. Where the partial pressure of oxygen is higher?
4. What is called Diffusion?
5. What is hemoglobin?
6. What is the oxygen capacity of the blood?
7. How is carbonic dioxide transferred?
8. What is called oxyhemoglobin?
9. What is carbohemoglobin?

Task 2.

Complete the sentences. Put the verbs in proper form:

1. On physical exertion the patient’s … become deep.
2. When the temperature is high a patient usually … deeply.
3. When one … the lungs dilate.
4. When one … the lungs contract.

(Breathe, breathe out, breath, breathe in)

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Ответы на вопрос:

Ekaterina785
Ekaterina785
4,8(89 оценок)

1. We had to go and buy some medicines last night.

2. You had to pay the rent last Monday.

3. John has to sign the contract next year.

4. I had to water the flowers yesterday.

5. I have to fly to Britain tomorrow.

6. We have to mend a broken wardrobe tomorrow afternoon.

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